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Determination of the enthalpy of crystallization of eutectic melt in the system 2CaO.Al2O3.SIO2-CaO.SiO2

K. Adamkovičová, L. Kosa, I. Proks, and I. Tarina

Institute of Inorganic Chemistry, Centre for Chemical Research, Slovak Academy of Sciences, CS-842 36 Bratislava

 

Abstract: Using a precursor method the melt of eutectic composition in the system  2CaO.Al2O3.SIO2-CaO.SiO2 (45.6 mass % CaO; 13.4 mass % Al2O3; 41.0 mass % Si02) was prepared. The temperature dependence of the specific relative enthalpy of the eutectic melt was determined using the experimental data obtained in "drop" calorimeter and in the calorimeter for determina­tion of heats of dissolution. Preparation of gehlenite (2CaO • Al2O3•Si02) and wollastonite (CaO Si02) which are the products of crystallization of the eutectic melt and the temperature dependences of their specific relative enthalpy were published in the previous papers. On the basis of the values of the specific relative enthalpy of the eutectic melt, gehlenite, and wollas­tonite at the equilibrium temperature of crystallization of the eutectic melt 1591 К and from the material balance of this crystallization the specific enthalpy of crystallization of the eutectic melt was determined Δhcryst(eut. melt; 1591 K) = (-286 ± 18) kJ kg-1 The error was determined on the level of significance equal to 95 %.

Full paper in Portable Document Format: 431a17.pdf

 

Chemical Papers 43 (1) 17–23 (1989)

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